4-5 HOURS BEFORE SERVING:Spray large cookie sheet with cooking spray and space bread loaves on pan.Spray top of loaves and cover with cling wrap. Allow to rise warm, dry place until puffed up very soft. Prepare two baking sheets. Line with parchment paper or spray with cooking spray.
Preheat oven to 375°.
Brown sausage in skillet breaking apart as you cook.
Add onions and green peppers and sauté until onions are softened. Stir in mushrooms and continue cooking for another minute. Drain off any oil or liquid. Set aside.
With rolling pin, roll out one loaf at a time on clean, bare counter making a rectangle roughly about 11x14".
Pat ham dry and evenly spread half on the dough keeping about 1½ inch from edges.
Spread half of the salami on top of ham.
Spread half of the pepperoni on top of salami.
Spoon on half of the sausage & veggie mixture.
Top with half of the mozzarella cheese.
Whisk the egg with 1t of water. Use a basting brush and spread all around the outside of the dough.
Starting on long end, carefully lift 2-3 inches of the dough and fold over the fillings.Fold in the sides in by 1-2 inches. Carefully lift and roll, continuing to keep the sides folded in.Gently pinch the edge into the dough using more egg wash if necessary. Carefully lift and place diagonally on prepared baking sheet, seam side down.Use a sharp knife to cut 5-6 vents in the top. Generously brush top with egg wash. Sprinkle with half of the parmesan cheese and sprinkle with Italian seasonings or oregano.
Bake in preheated oven for 35-40 minutes.
Heat pizza sauce for dipping. Slice and serve!